Water tube boiler



March 3, 1953 A. E. FOREST 2,630,103

WATER TUBE BOILER Filed Aug. 21, 1948 3 Sheets-Sheet 1 mm. AIV@ March 3,1953 A. E, FOREST 2,630,103

WATER TUBE BOILER Filed Aug. 21, 1948 s sheets-sheet 2 March 3, 1953 A.E. FOREST 2,630,103

' WATER TUBE BOILER Filed Aug. 2l, 1948 3 Sheets-Sheet 5 1| l l* l Il Il@gag I@ N Q@ @QQ N 1% 11 Q91@ @@@QQIQQQ' QQQQQ@ @6:6

G a *f5 y P dG/Ja Patented Mar. 3, 1953 UNITED STATES PATENT OFFICE I l2,630,103- i v WATER TUBE BOILER Alfred vE. lForest, Springfield; Ill.,assignor to Springfield-Boiler Company, Springfield, Ill., a

corporation of Illinois pplicatonugus'tZl, 1948,.'Serial No. 45,487

My invention relates to a boiler, and has "for one purpose to provide aboiler of the water tube type.

Another purpose is to provide a Water tube boilerhaving an improvedarrangement of steam generating tubes.

Another purpose is to provide Vaboiler having an improved arrangementofheat exchange passages by which the heated products of'combustion areput in heat exchange relation with Vthe steam generating tubes.

Another purpose is to provide a simple and eflicient furnace wallstructure.

Another purpose is tc provide a furnace particularly adapted for usewith burners in 4which a horizontal dame is projected along alongitudi.-nally extending combustion chamber. 4

y Other purposes will -appear from time to time in the course of thespecification and claims.

I illustrate the inVentionm-ore or less diagrammatically in theaccompanying drawings wherein:

Figure 1 is a vertical .longitudinal section;

Figure 2 is a vertical .transverse section on the line 2-2 of Figure l;and A Figure 3 is a horizontal 4section son the 3--3 o Figure 1.

Like parts are indicated by like symbols throughout the specificationand drawings.

Referring to the drawings, l generally .indie cates a bottom supportingstructure which may include longitudinally extending vchannels .2 andsuitable cross beams or supports 3. It will line 8 Claims. (C1. 122-138)Cil be understood that the details of .the supporting structure may bewidely varied. Extending upwardly from the base `thus formed aresidewalls which I indicate as including outer shell members 4, 5, within`which are fanysuitableliners 6, l of any suitable heat resistant.material or refractory.

Supported on or extending longitudinally along `the base I is thelower'drum 8. Extending from the drum lil to the sidelirier f6 is abottom liner 9. Extending from `the drum 8 to the -side liner 1 is abottom liner A|l0 which underlies the below described combustion space.4llis an upper or steam drum. It is connected to the upper end of theside wall members 5, -'lv "by the outer shell I2 and the liner i3, whichare inclined, as shown in Figure 2, and which partially overlie thebelow -described combustion space. It will be noted that, in 'a lbroadsense, the drums A and Il constitute part of the `outer wall of thegeneral boiler structure.

The drum r Il `is connected to the sidewall members 4, E

2 bythe outer shell I4 and the liner l5. Anysuitable 'outer'jacket `orinsulation I3 may surround the otherwise exposed part of the steam drumll. As will be clear from Figure 1, I empl-oy a rear end wall includingthe outer shell Il, the liner I8, and the inner refractory liner i9which closes the end of 'the combustion space. 2li is an inspectionaperture suitably closed by the removable plug 2l. VThe front end of theboiler is closed by the front end Wall having `the outer shell 22, theliner '23, and the refractory 2K4. 25 generally indicates a liquid fuelburner, the details of which do not, of themselves, forni `part of thepresent invention. It may include a nozzle element 2.6, from which dameis directed through the ared aperture 42l. 28 is an inspection aperturefrom which extends the outwardly taperedV inspection tube 29. 30indicates any' suitable outer housing which surrounds `the nozzle 25 andthe inlet space to the combustion chamber; Y

They two drums are shown as connected by a plurality of tubes which arearranged in two groups, lgenerally identied as A and B. The tubes A arearranged in a bank, most of which have intermediate vertical lengths 3l.These vertical 'lengths are connected yby angles or bends 32 with thelower or mud drum 8, 'connected by angles or bends 33 with the upper orsteam drum Il. A generally vertical, longitudinally extending,intermediate piartition'35 extends upwardly from the false bottom 35 ofthe combustion space, generally indicated .as X. An intermediate,transversely extending partition 31 has a right-hand portion, referringto the position of the parts `as shown in Figure 2, which closes the topof the combustion space X, and the left-hand portion 31a which separatesthe steamgenerating space into a lower passage Y and an 'upper passageZ, `the two passages being connected at their front end-s by a space XX,which is substantially free from `the tubes A. It will be understood, asshown in Figure 3, that the combustion space X extends tothe rear wallelement i9, the products of combustion moving in the direction of thearrows of Figure 3. They then `pass to the left, referring to Figure 3,in the direction of the arrows, passing around the rear end lof thevertical longitudinal partition 35. The gases then pass 'forwardly alongthe lower passage Y and about the tubes A. At the front of the boilerthe gases move upwardly through the passageXX andreturn rearwardlyalongthe upper passage Z, still in communication lwith "the upper portionsAof the tubes A. The gases may then escape from any suitable ue outlet,more or less diagrammatically shown at 38.

The tubes B are so arranged, as will be clear from Figures 2 and 3, tosurround the combustion space X. Some of the tubes B pass below thefalse bottom 36, which may consist of readily replaceable bricks orslabs of suitable refractory material. Any suitable -bodies ofrefractory cement may be employed where needed, as at 39 and 40. Theupper passage Z may be completed by an intermediate partition 4|extending between the wall 3l' and the lower portion of the upper orsteam drum Il. Access passages or ducts 42 may be provided for thepassages Y and Z, as shown in Figures 2 and 3.

Any suitable forced draft system may be employed. I illustrate, forexample, a blower housing 45 of the snail shell type, which may carryany suitable fan driven by the belt 46, from any suitable motor notherein shown. The output of the fan may ow through any suitable passage41 formed in or extending through the base, and upwardly into Ithe abovedescribed burner-surrounding or delivery housing 30,

The interior details of the drums do not form part of the presentinvention and are not herein described. The present invention isdirected primarily to the arrangement of the tubes in relation to thepath or passages along which the heated products of combustion pass.

It will be realized that, whereas, I have clescribed and illustrated apractical and operative device, nevertheless many changes may be madelin the size, shape, number and dispo-sition of parts with-out departingfrom the spirit of my invention. I therefore wish my description anddrawings to be taken as in a broad sense illustrative or diagrammatic,rather than as limiting me to my precise showing.

The use and operation of the invention are as follows:

I illustrate a simple, compact and eici-ent structure in which an upperor steam drum and a lower or mud drum are connected to water tubes whichare divided into two bodies, one of which surrounds a longitudinallyextending combustion space and the other of which extends through twoparallel, horizontally longitudinal heat exchange passages or chambers.It will be noted that the upper drum is substantially offset from thelower. One advantage of this arrangement is that adequate space is givenfor the upper passage Z, which is open from the top of the boilerstructure down to the intermediate partition 3la. The combustion chamberX is surrounded by o-ppositely bent groups of the tubes B. These tubesare surrounded and backed by liners l', I0, 35 of suitable material.However, I nd it advantageous to overlay the bottom of the combustionspace by the readily replaceable false bottom or liner 36 which actuallyoverlies and covers that part of the tubes B which extend directlybeneath the bottom of the combustion chamber X. I Ymay also flex some cithe tubes A across the bottom of the transverse partition Sla, as shownin Figure 1.

I claim:

1. In a boiler structure, walls and intermediate partitions dei-ming agenerally horizontally extending combusticn chamber and two heatexchange passages lying generally one above the other, adjacent andgenerally parallel with the combustion chamber, the structure includinga transversely extending partition intermediate the top and the bottomof the boiler structure, one part of said partition separating said heatexchange passages, and another part of said partition forming a topliner wall for the combustion chamber, the combustion chamber having anend formed and adapted to admit a generally horizontally directed burnerflame, the two heat exchange passages being connected to each other atopposite ends of the boiler structure, one of said passages beingconnected at one end to the inner end of the combustion chamber, and aflue outlet for the passage which is not connected to the combustionchamber, the ilue outlet being located at the end of the passageopposite to its connection with the opposite passage, an Vupper and alower drum, and tubes connecting said drums, some of said tubesextending generally vertically through said heat exchange passages andothers surrounding said combustion chamber.

2..In a boiler structure, walls and intermediate partitions defining agenerally horizon-tally extending combustion chamber and two heatexchange passages lying generally one above the other, adjacent andgenerally parallel with the combustion chamber, the combustion chamberhaving an end formed and adapted to admit a generally horizontallydirected burner llame, the two heat exchange passages being connected toeachother at opposite ends of the boiler structure, one of said passagesbeing connected at one end vto the inner end of the combustion chamber,a flue outlet for the passage which is not connected to the combustionchamber, the ue outlet belng located at the end of the passage oppositeto its connection with the opposite passage, an upper and a lower drum,and tubes connecting said drums, some of said tubes extending generallyvertically through said heat exchange passages and others surroundingsaid combustion chamber, and a removable false bottom overlying the tubelengths which extend across the bottom portion of the combustionchamber.

3. The structure of claim 2 characterized in that the removable falsebottom overlying the tube lengths which extend across the bottom portionof the combustion chamber is formed of heat insulating material and hasa generally plane top surface.

4. In a boiler structure, walls and intermediate partitions defining agenerally horizontally extending combustion chamber and two heatexchange passages lying generally one above the other, adjacent andgenerally parallel with Vthe combustion chamber, the combustion chamberhaving an end formed and adapted to admit a generally horizontallydirected burner flame, the two heat exchange passages being connected toeach other at opposite ends of the boiler structure, one of saidpassages being connected at one end to the inner end of the combustionchamber, and a iiue outlet for the passage which is not connected to thecombustion chamber, the ue outlet being located at the end of thepassage opposite to its connection with the opposite passage. an upperand a lower drum, and tubes connecting said drums, some of'said tubesextending generally vertically through said heat exchange passages andothers surrounding said combustion chamber, the combustion chamber beingsubstantially equal in transverse section to each of the heat exchangepassages in transverse cross section thereof.

5. In a boiler structure, walls and intermediate partitions defining agenerally horizontally disposed combustion chamber, at least two heateg.

change passages disposed one above the other with relation to eachother, said passages being adjacent and generally parallel to thecombustion chamber, one of said passages residing in the same horizontalplane as the combustion chamber, said combustion chamber having an endformed and adapted to admita generally horizontally directed burneriiame, said heat exchange passages being connected to each other atopposite ends of the boiler structure, the said one of the passagesbeing connected at one end to the inner end of the combustion chamber,and a ue outlet for a passage which is not connected to the combustionchamber, the nue outlet being located at the end of the passage oppositeto its connection with another passage, an upper and a lower drum, andcontinuous tubes connecting said drums, some of said tubes extendingcontinuously generally vertically through said heat exchange passagesand others surrounding said combustion chamber.

6. In a boiler structure, walls defining an outer shell of heatinsulating material, an upper drum and a lower drum included in saidwalls. a generally vertical, longitudinally extending intermediate walldefining, at one side thereof, a combustion chamber, said combustionchamber having an end formed and adapted to admit a generallyhorizontally directed burner flame, tubes extending continuously betweensaid drums, some of said tubes extending generally vertically atopposite sides of said combustion chamber, and being exposed to andlining the interior of said combustion chamber, said boiler structurehaving two heat exchange passages parallel with and located at one sideof said combustion chamber, one of said passages being located above theother, the lower of said passages being in communication with the innerend of the combustion chamber, the upper of said passages beingconnected to the lower passage at one end and to a ue outlet at theother, and additional tubes extending continuously between said drumsand through said heat exchange passages.

7. The structure of claim 6 characterized by and including atransversely extending partition intermediate the top and bottom of theboiler structure, one part of said partition separating the two heatexchange passages, and another part of said partition forming an upperliner wall for the combustion chamber.

8. The structure of claim 6 characterized by and including a removablefalse bottom overlying the bottom portion of the combustion chamber,some of the tubes which line the combustion chamber extending acrosssaid bottom portion and beneath said false bottom.

ALFRED E. FOREST.

REFERENCES CITED The following references are of record. in the le ofthis patent:

UNITED STATES PATENTS Number Name Date 695,641 Hampson Mar. i8, 1902753,360 Chaquette Mar. 1, 1904 945,733 Sturm Jan. 4, 1910 1,999,983Schmidt Apr. 30, 1935 1,999,984 Bailey et al Apr. 30, 1935 2,086,599Bros July V13, 1937

